新的閃爍建議將如何影響LED照明設計

　　有研究表明，閃爍––亮度隨時間變化––照明在一定頻率范圍內發(fā)生危害健康。雖然這個問題是針對白熾燈和熒光照明，它再次出現(xiàn)了設計工程師的挑戰(zhàn)，因為引進的LED為主流照明。

　　但現(xiàn)在，經過廣泛的調查，美國的電氣和電子工程師協(xié)會（IEEE）已經公布了消除LED照明中可見閃爍的推薦做法。題為“推薦實踐調節(jié)高亮度LED電流降低健康風險的觀眾，”IEEE Std. 1789-2015解釋什么是閃爍的LED照明提供了可以幫助制造商設計產品，盡可能減少閃爍相關的健康和生產力的影響指導稱。

　　The primary source of flicker in an LED-based product is the power supply or “LED driver.” LED-based products with well-designed drivers can deliver light with minimal flicker， but doing so can increase the cost and/or size of the driver circuitry. For example， smaller products such as MR16 replacement lamps are more susceptible to flicker due to size limitations on the driver.

　　This article takes a look at why flicker should be controlled， describes the IEEE recommendations and considers a selection of contemporary drivers that could be employed as the basis of a flicker-free power supply.